杨健;谢燕翔;

• 1:榆林学院能源工程学院榆林市新材料技术研究中心
• 2:西安文理学院陕西省表面工程与再制造重点实验室

摘要(Abstract)：

以纯Ni粉末作为熔敷材料,用光纤激光器在316L不锈钢表面进行激光熔敷。用SEM、EDS、XRD分析熔敷涂层的组织形貌与物相组成,采用电化学方法研究涂层与基材在3.5%NaCl溶液中的腐蚀行为。结果表明:涂层表面光滑,微观结构致密,与基材结合良好,涂层主要为γ(Ni,Fe)固溶体和FeNi3相,从顶部到底部组织形态依次为等轴晶、柱状晶、胞状晶,界面结合区为平面晶;涂层的自腐蚀电位为-0.13 V,电流密度为5.012×10-7A/cm2,相比于不锈钢基材,涂层的自腐蚀电位提高0.16 V,电流密度降低55.33%,腐蚀阻抗值高于基材,涂层表面钝化膜无夹杂物,完整性更高,点蚀萌生更加困难,同时可降低点蚀扩展速率,保护不锈钢基材。

关键词(KeyWords)： 316L不锈钢;纯Ni粉末;激光熔敷;微观组织;腐蚀行为

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51601167;51861034);; 陕西省科技统筹重大项目(2016KTZDGY04-03;2018GY-129);; 陕西省教育厅专项科研计划项目(18JK0907)

作者(Author): 杨健;谢燕翔;

Email:

DOI: 10.14024/j.cnki.1004-244x.20180803.002

参考文献(References)：

• [1]史艳华,于洋,梁平,等.316L不锈钢在氯离子环境中的腐蚀行为[J].材料保护,2015,48(8):29-32.
• [2]PARDO A,MERINO M C,COY A E,et al.Pitting corrosion behaviour of austenitic stainless steels-combining effects of Mn and Mo additions[J].Corrosion Science,2008,50(6):1796-1806.
• [3]PAN C,LIU L,LI Y,et al.Pitting corrosion of 304ss nanocrystalline thin film[J].Corrosion Science,2013,73:32-43.
• [4]石林,郑志军,高岩.不锈钢的点蚀机理及研究方法[J].材料导报:综述篇,2015,29(12):79.
• [5]AHMAD S,MALIK A U.Corrosion behaviour of some stainless steels in chlorinated gulf seawater[J].Journal of Applied Electrochemistry,2001(31):1009-1016.
• [6]ELKHOSHKHANY N,HAFNWAY A,KHALED A.Electrodeposition and corrosion behavior of nano-structured Ni-WC and Ni-Co-WC composite coating[J].Journal of Alloys and Compounds,2016,695:1505-1514.
• [7]王东生,田宗军,沈理达,等.激光熔覆技术研究现状及其发展[J].应用激光,2012,32(6):538-544.
• [8]WANG Q Y,WANG X Z,LUO H,et al.A study on corrosion behaviors of Ni-Cr-Mo laser coating,316 stainless steel and X70 steel in simulated solutions with H2S and CO2[J].Surface&Coatings Technology,2016,291:250-257.
• [9]XU X,MI G,CHEN L,et al.Research on microstructures and properties of Inconel 625 coatings obtained by laser cladding with wire[J].Journal of Alloys&Compounds,2017,715:362-373.
• [10]孙焕,林晨,陶洪伟,等.真空高频感应熔覆Ni60-WC复合涂层的耐蚀性[J].中国表面工程,2013,26(6):35-41.
• [11]曾维华,刘洪喜,王传琦,等.工艺参数对不锈钢表面激光熔覆Ni基涂层组织及耐腐蚀性能的影响[J].材料工程,2012(8):24-29.
• [12]FARAHMAND P,KOVACEVIC R.Corrosion and wear behavior of laser cladded Ni-WC coatings[J].Surface&Coatings Technology,2015,276:121-135.
• [13]MOUSTAFA S F,ABDEL-HAMID Z,BAHEIG O G,et al.Synthesis of WC hard materials using coated powders[J].Advanced Powder Technology,2011,22(5):596-601.
• [14]CUI M,PU J,ZHANG G,et al.The corrosion behaviors of multilayer diamond-like carbon coatings:Influence of deposition periods and corrosive medium[J].RSC Advances,2016,6(34):28570-28578.
• [15]朱敏,袁永锋,刘俊,等.Incoloy825合金在不同温度3.5%NaCl溶液中的腐蚀行为[J].中国腐蚀与防护学报,2016,36(6):631-636.
• [16]LEI J,SHI C,ZHOU S,et al.Enhanced corrosion and wear resistance properties of carbon fiber reinforced Ni-based composite coating by laser cladding[J].Surface&Coatings Technology,2018,334:274-285.
• [17]NEWMAN R C.Materials science:beyond the kitchen sink[J].Nature,2002,415(6873):743-744.
• [18]DONIK Cˇ,PAULIN I,JENKO M.Influence of MnS inclusions on the corrosion of austenitic stainless steels[J].Materiali in Tehnologije,2010,44(2):67-72.